In 1900, Andrew Mellon married Nora McMullen, a granddaughter of Brewer Peter Guinness, whom he divorced for desertion in 1912, after she had borne him two children, Ailsa and Paul.

Mellon was in his forties when, to everyone's astonishment, he fell madly in love with Nora McMullen, a 19-year-old English girl whom he met on a boat.